Siemens Q350H U Three-Phase Electrical Contactor

Siemens Q350H U is a three-pole molded case circuit breaker (MCCB) in the Siemens QPH family, rated for 50 A and 240 V AC. Designed for plug-in mounting in compatible Siemens panels, it provides overcurrent protection for three-phase feeders and equipment by interrupting on overload or short-circuit events. The device supports up to 22 kA short-circuit current rating at 240 V, supporting safe interruption for typical industrial fault currents. Common applications include protection of motors, pumps, and other three-phase loads within distribution panels and motor control centers that operate on a 240 V three-phase supply. As a QPH-type MCCB, the Q350H U is designed for plug-in compatibility with standard Siemens QP/QPH bus systems, enabling straightforward replacement in compatible enclosures. When selecting this breaker, confirm that the panel and downstream circuitry require a 50 A, 240 V three-phase protective device and that the unit’s interrupting rating aligns with the system fault-current requirements.